Motors moving without commands

Hi everyone!
Im new in this Arduino World, then Im sorry if that is stupid.
I`ve made an robot with 4 DC motors, Shield l293d and HC-06 bluetooth.
But when I turned on the Arduino and Shield l293d and it started to run by himself.
I have no idea why is this happening, any sort of help is more than welcome.

Thaanks

Quase_La.ino (3.4 KB)

Got a non-fritzing schematic you can show?

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